<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>上下文菜单</title>
    <script src="event.js"></script>
</head>
<body onload="onload()">

<h1>上下文菜单</h1>
<div id="panel" style="background-color: brown;width:300px; height:200px"></div>
</body>
</html>
